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#include <camellia/errno.h>
#include <camellia/fsutil.h>
#include <kernel/arch/amd64/ata.h>
#include <kernel/arch/amd64/driver/driver.h>
#include <kernel/arch/amd64/driver/util.h>
#include <kernel/panic.h>
#include <kernel/proc.h>
#include <kernel/vfs/request.h>
#include <shared/mem.h>
static const int root_id = 100;
static void accept(VfsReq *req);
void pata_init(void) {
ata_init();
vfs_root_register("/kdev/ata/", accept);
}
static void accept(VfsReq *req) {
int ret;
long id = (long __force)req->id;
char wbuf[4096];
size_t len;
switch (req->type) {
case VFSOP_OPEN:
if (reqpathcmp(req, "")) ret = root_id;
else if (reqpathcmp(req, "0")) ret = 0;
else if (reqpathcmp(req, "1")) ret = 1;
else if (reqpathcmp(req, "2")) ret = 2;
else if (reqpathcmp(req, "3")) ret = 3;
else ret = -ENOENT;
// TODO don't allow opening nonexistent drives
vfsreq_finish_short(req, ret);
break;
case VFSOP_READ:
if (id == root_id) {
// TODO use dirbuild
char list[8] = {};
size_t len = 0;
for (int i = 0; i < 4; i++) {
if (ata_available(i)) {
list[len] = '0' + i;
len += 2;
}
}
vfsreq_finish_short(req, req_readcopy(req, list, len));
break;
}
fs_normslice(&req->offset, &req->output.len, ata_size(id), false);
len = min(req->output.len, sizeof wbuf);
ata_read(id, wbuf, len, req->offset);
pcpy_to(req->caller, req->output.buf, wbuf, len);
vfsreq_finish_short(req, len);
break;
case VFSOP_WRITE:
if (id == root_id) {
vfsreq_finish_short(req, -EACCES);
break;
}
fs_normslice(&req->offset, &req->input.len, ata_size(id), false);
len = min(req->input.len, sizeof wbuf);
if (len != 0) {
len = pcpy_from(req->caller, wbuf, req->input.buf, len);
ata_write(id, wbuf, len, req->offset);
}
vfsreq_finish_short(req, len);
break;
case VFSOP_GETSIZE:
if (id == root_id) {
// TODO getsize for all kernel provided directories
panic_unimplemented();
}
vfsreq_finish_short(req, ata_size(id));
break;
default:
vfsreq_finish_short(req, -ENOSYS);
break;
}
}
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